(8) Debt

Debt consisted of the following (in thousands):

	As of
	March 31,			December 31,
	2018			2017

Revolving credit facility	$	50,000		$	70,000
Term loan		148,500			152,625
Less unamortized discount		(367	)		(399	)
Less unamortized term loan debt issuance costs		(566	)		(615	)
Less current portion of long-term debt		(16,500	)		(16,500	)
Long-term debt, net, less current portion	$	181,067		$	205,111

Principal payments on debt are due as follows (in thousands):

2018 (remaining)	$	12,375
2019		16,500
2020		20,625
2021		149,000
Total	$	198,500

The estimated fair value of the Company’s debt based on Level 2 inputs using the market approach, which is primarily based on rates at which the debt is traded among financial institutions, approximates the carrying value as of March 31, 2018 and December 31, 2017.